package com.qk.interceptor;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Slf4j
@Component
public class TokenInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取请求路径
        String url = request.getRequestURI();

        // 2.判断请求路径是否为登录请求, 如果是则放行
        if (url.contains("/login")) {
            log.info("登录请求:{},放行", url);
            return true;
        }
        // 3.获取请求头token
        String jwt = request.getHeader("token");

        // 4.判断token是否存在, 如果为不存在,响应401状态码
        if (jwt == null || jwt.isEmpty()) {
            log.info("请求头token不存在");
            response.setStatus(401);
            return false;
        }
        // 5.解析令牌,如果解析令牌报错,响应401状态码
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);// 获取用户Id, 存入ThreadLocal
            log.info("当前用户存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        } catch (Exception e) {
            log.info("令牌解析失败");
            response.setStatus(401);
            return false;
        }
        // 6.如果解析成功, 放行
        log.info("令牌解析成功,放行");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

        // 7.请求结束, 移除当前用户
        CurrentUserHoler.removeCurrentUser();
    }
}
